Hot Roller Thermistors And Thermostats; Temperature Control - Ricoh Neptune-P1 Service Manual

6. Details

Hot Roller Thermistors and Thermostats

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Three thermistors monitor the temperature of the hot roller and pressure roller:
• Thermistor [A] monitors the temperature of the hot roller.
• Two thermistors [B] monitor the temperature of the pressure roller. One thermistor is at the center of
the pressure roller and the other is near the end of the pressure roller.
Thermostat [C] (199°C) and thermostat [D] (200°C) give emergency heat protection. If one of the
thermistors breaks, one of the thermostats will cut power to the fusing lamp. Also, interlock switches cut
power to the fusing circuit when a cover is opened.

Temperature Control

Paper Thickness Setting
To achieve and maintain optimum fusing, the operator must select on the operation panel the proper setting
for the thickness of the paper. This ensures that the machine sets and maintains the correct target
temperatures for the hot roller and pressure roller during the job.
• Strict control of the fusing temperature is necessary to prevent wrinkling that can occur at high
temperatures with different types of paper.
Changing the paper thickness default setting can improve results if copy images are blurred or wrinkled.
The paper thickness default setting screen can be opened by the operator with the User Tool:
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